120 Rev. A. M. Norman's Notes on British Ampliipoda. 



As observed by Bate northern specimens g-reatlj exceed in 

 size those from southern localities. A Spitzbergen specimen 

 in my collection measures (exclusive of antenna?) 37 millim. 

 in length ; large British examples measure 23 millim., while 

 in a series from Cornwall the greatest length is only 12 

 millim. 



The larger the specimen the more strongly marked are the 

 sculpture and elevation of both dorsal spines and carina. In 

 its younger stages there are no dorsal carinal teeth, the eye is 

 small and nearly round, and the state is accurately represented 

 by Bates's figure of Graia imhricata. But Graia imhricata 

 is described and figured as having no secondary appendage 

 to the antcnnules. The young always have such an appen- 

 dage, though it is reduced to two articulations. My North- 

 umberland specimens of Graia imhricata^ taken by the late 

 ]\lr. Alder and recorded by Bate, were preserved dry, which 

 may account for the appendage liaving been overlooked ; they 

 were undoubtedly the young of the present species. It is not 

 improbable that Mr. Webster''s specimens were similarly pre- 

 served, as that gentleman sent to myself Amphipods only in 

 that state. The fine figures of Buchholz may be consulted 

 with advantage, and the difference in armature of ])era?opods, 

 uropods, &c. there shown in the young and the adult have 

 their warning lesson against the establishment of species on 

 slight variations *. 



Hah. Mostly taken in tide-pools among weeds ; Shetland ; 

 Firth of Clyde ; Durham and Northumberland coasts ; the 

 Humbcr; Devon and Cornwall [A. M. N.) : Mas. Norm. 

 Liverpool Bay {A. 0. ll^alker). 



Distribution. Spitzbergen {Loven) ; Tromso [Schneider) : 

 Mus. Noo-m. Greenland [Ross &c.) ; Siberia {Stuxberg) ; 

 Norway [Ratlihe d:c.) ; Sweden [LiUjeborg) ; Denmark 

 {Meinert) ; Kiel [Blanc) ; Western France (Ckevreaux &c.) ; 

 Boulogne [Chevreaux) ; North-east America {Stimjjson). 



Genus II. Melphidippa, Boeck, 1870. 



Mandibles with a short and verj'' narrow palp, third joint 

 shorter than the second. First maxillce having the inner 

 lamina moderately broad but not long, inner margin with 

 numerous plumose seta?. MaxilUpeds with narrow elongated 

 palps ; outer lamina short, broad, with a few small teeth on 

 the inner margin. Form elongated, especially the pleon ; 

 segments of pleon armed on the hinder margin with teeth of 



* British young examples in ray collection 3-4 millim. long exactly 

 agree with Buchholz's iigure of that stage. 



